As adjectives the difference between preexisting and preexistent
is that preexisting is already in {{l/en|existence}} before (something else) while preexistent is existing previously.
As a verb preexisting
is present participle of lang=en.
preexisting
English
Alternative forms
*
* pre-existing
Verb
(head)
preexistent
English
Adjective
(
-)
Existing previously.
Preceding existence.
- a preexistent state
- (Pope)
(
Webster 1913)